| Borrelia turicatae | A species found as a cause of relapsing fever in Mexico, New Mexico, Texas, Oklahoma, and Kansas; transmitted by Ornithodoros turicata. (05 Mar 2000) |
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| Borrelia venezuelensis | A species causing spirochetal relapsing fever in Central and South America; transmitted by Ornithodoros rudis and O. Venezuelensis. (05 Mar 2000) |